package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.aliyun.oss.common.utils.HttpUtil;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.apache.juli.WebappProperties;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {

    private static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private WeChatProperties weChatProperties;

    /*
    * 返回用户对象（openid）
    * */
    @Override
    public User getUserOpenId(UserLoginDTO userLoginDTO) {
        //向微信客户端发送请求，获取用户的openid
        String openid = getOpenid(userLoginDTO.getCode());

        //判断openid是否存在
        if(openid == null){
            //抛出登陆异常
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        //判断用户是否是新用户，是就进行快速注册
        User user = userMapper.selectByOpenId(openid);
        if(user == null){
            user = new User();
            user.setOpenid(openid);
            user.setCreateTime(LocalDateTime.now());
            userMapper.insertNewUser(user);
        }

        //返回用户对象
        return user;
    }

    private String getOpenid(String code){
        //向微信客户端发送请求，获取用户的openid
        Map<String, String> map = new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code", code);
        map.put("grant_type","authorization_code");
        String json = HttpClientUtil.doGet(WX_LOGIN, map);

        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");

        return openid;
    }
}
